Hydraulic valve



E. MATHIEU.

HYDRAULIC VALVE.

APPLICATION man Ams, 1920.

Patented July 19, 1921.

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`IlEYCl'GvNE MATHIEU, OIE" NEUILLY-SUR-SEINE, FRANCE.

HYDRAULIC verve.

4ilippleatioiri led April 9,

T o aZZ'whom t may concern.' 'Q y y Be it known that l, EUGNE lrlA'ri-rrnu, of 26 rue Victor `Noir, Neuilly sur- Seine, France, engineer, yhave `invented new, and useful Improvements in 'Hydraulic Valves, which improvements are fully set forth in the following specification. i o Y y Apparatus for controlling and distribf. uting iuids at highpressures, especially water for actuating'a press or other hydraulic apparatusV at present comprise' closing members which are not fluid tight after prolonged use. ,o v

To maintain slide or vother valves fluid tight, erosionlmust be avoided and this inevitably and rapidly takes place so soon'as the smallest lea-k takes place due to the high speed of fluid `at a high pressure; thebearing surfaces .become quickly wornand seatings and valves are destroyed ina very short time; moreover the walls of theapparatus which receive theflive force ofiiuids' directed on them are even attacked. V

If the distributing member consists of a i tubular slide valve, providedwith a number of holes passing frictionally over the lip of cup leather, the same thing occurs for under the high pressure the leather partially 'penetrates into the holes; and at each movement of the 4slide a little material becomes detached and this is the case when very small holes are employed to the detriment of efficiency; the holes form rasps and in alittle time destroy the packing.

This erosion of the closing surfaces takes place moreover more quickly while the memaers are stationary under the pressure for now that the fluid no longer looses bulk it attains its greatest pressure and maximum speed through any slight imperfection of the surfaces in contact.

This invention overcomes these defects and while especially suitable for distributing luids at high pressure is not limited thereto.

The system of distribution which forms the subject of the present invention comprises a movable distributing member whose surface which rubs when displaced against a suitable packing is continuous but allows a fluid outlet orifice in its wall of the desired size to open so soon as the said packing has been passed.

The invention is illustrated in the accompanying drawings and is shown appliedto a hydraulic distributer with feed arrange- Speciication ofleltters Patent, e `Pgjigint@d July 19, i921,

1920; seriai'gnofevaca5-l ment of an hydraulic press for example and discharge arrangement combined.`

ln'the drawings Figure l is a sectionofa distributer showing the inlet opengand the outlet closed while Fig. 2 is a similar view, the inlet being closed and the outlet open.

a is a casing which comprises an inlet Y and an outlet c. *Within the casing a is a plunger bored outand provided with suitably' arranged fluid tight packings preferably' cup leathers; `the plunger Z is operated vby any suitable external mechanism such as a screw lever or the like. As the diameters of plunger sealed by 'packingse and f are of identical `size opposing pressures on the plunger are eliminated.

YA packing g of the salme diameter separates the fluid inlets chamber b from the chamber c and from theoutlet pipe c.

The plunger Z isprovided witha movable annular member which can slide on 1 the plunger within the packing g. vThe annular member is provided with'internal holes a' which communicatev on one side with the inlet chamber b. 7c :is a spring which con-v stantly tends to press its edge Z against `a The inlet is supposed closed (Fig. 2) i while the plunger (l is by means of its control member moved into the casing a whereby the head it of the movable member h will strike against an abutment a and so be arrested; the plunger d on continuing its travel compresses the spring 7e and progressively forms an annular slot, opening or orifice 0 situated between the seating m and the edge Z of the movable member, thus allowing liquid under pressure to pass from the chamber Z) through vholes z' into the chamber c and the outlet pipe c Fig. l. l

When the plunger Z is moved in the reverse direction for closing, the spring l@ becomes stretched and progressively closes the opening o and when closed the holes or passages e' will no longer deliver` liquid unless there is leakage as may take place in all valves.

The plunger CZ on continuing its travel in the reversedirection having closed the annular orifice engages in the packing g; the orifice o presents only a very small lack of continuity of surface which cannot possibly cause weailof the packing; `moreover the packing cannot be torn by the distributing holes on the passage of the plunger as takes place with known distributers. i Z comes moreover to Vhen the plunger rest then the possible line of escape through the hole'o is closed as lit has passed the packing g (Fig. 2) the plunger is therefore free :from all difference of pressure vupon its faces for both internally and externally it sup! ports the same pressure i. e. that of the'inlet rangement( Itcomprises as betoregan annulainieI-nber 7j -Inovable along the Vplunger ZV and subjected to the action .of aspring g v which normally tends to closethe twewalls r and s of an `opening t. When the 4feed is Vopen Fig. l, liquid underrwoi'king pressure in thee-press passes into the chamber `u out- *fside the closed opening vt*but:liqiiiclboiiild, howeverypass'through leaks if such existedV and reach owing to looseness. between. the

partsthe outlet n ifnotpieventedbythe ycupl leather f mounted on the plunger between the 'pi-ess `fleather piecescllfand d2.

lThen to f close `the` feed the Vplunger, cl moves inthe reverse direction it moves with itthe packing ffand brings it Abeyond the 'closed opening Lathe piece Zfy'on coming against the: flange pion ithe annular member p Fig. Z-Qperat'es the annular `piece p so ,y 40 compressing the spring g and causing ori- Here MO b'pogressively Opened to allow the outlet of theJ 1iqud j As above set out theV invention is not con neditodistributing higlijpressure fluid; it

ismoreover not only applicablewith nunierous'modiications to slide valves but also to' cocks, sluicesfetc., and in `general to all cases in which it is desired to obtain perfect ytightness and l,easy maintenance.

"Claims: f

l. In a high pressure distributing valve, the combinationrofa,movable meinbei a packing sealinga continuous rubbing surface oi'ilsaid. member, an outlet in the wall tliei'eof` closedwhile Athe packing and -yineans for opening the outlet as soon as the packing has been passedtherebya `2.7111 a high pressui'e'distributing valve,

the 4ec'inibination ,of fa"l movable V"i'iiember consistingofa' plungermoving ina "casing, a hollow van'iii'ilar lmember ,Y lmovable thereon Aand controlling gthe fluid passage and l Y springiiormally pressing saidannulai` member againstl seating tand, an abutment 'adapted to arrestthe movementofisaid anv iiularfmernbe r during the travel of tlie plun- @erf Yi. i f ci C ,i -i

, 3.- A hifrh y ressure distributing valve comprising ay movable member having a packing engaging ay continuous'rubbing sur- 'face' of ,said member" and outlets vin its wall eontrolliiig'fthe feed and discharge' of the {iuidV combined with means for opening said `.outlets respectively inthe feeding and disvharge actions `as soon'nlas 4the outlet has EUGNE MATHIEU. 

